It's possible that you're misremembering the quote or the episode. Sylvester Jr. does appear in a few classic Looney Tunes cartoons like "Tweet Tweet Tweety" and "Tweety's S.O.S." but he doesn't generally have a speaking role.
To help pinpoint the episode you're thinking of, could you please provide any additional details? For example:
* What kind of situation was Sylvester Jr. in? Was he in trouble? Was he being scolded?
* What was the general plot of the episode? Did it involve Tweety Bird? Other characters?
* Was there a specific scene or animation style that sticks out in your mind?
With more information, I might be able to help you identify the episode.